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AIC1569A
5-bit DAC, Synchronous PWM Power Regulator
FEATURES
Compatible with HIP6004. Simple Voltage-Mode PWM Control. Dual N-Channel MOSFET Synchronous Drive. Fast Transient Response. 1% 5-Bit Digital-to-Analog Output Voltage. Adjustable Current Limit Without External Sense Resistor. Full 0% to 100% Duty Ratio. 200KHz Free-Running Oscillator, Programmable up to 350KHz. Power-Good Output Voltage Monitor.
DESCRIPTION
The AIC1569A is a high power, high efficiency switching regulator controller optimized for high performance microprocessor applications. It is designed to drive dual N-channel MOSFETs in a standard synchronous buck topology. Featuring a digitally programmable switching regulator, the AIC1569A includes monitoring and protection capabilities in addition to all the essential synchronous PWM control functions. The internal 5-bit Digital-to-Analog Converter (DAC) adjusts the output voltage from 2.0V to 3.5V in 0.1V increments and 1.3V to 2.0V in 0.05V increments. The precision reference and voltage-mode voltage shifts. The internal oscillator of the AIC1569A free-runs at 200KHz and can be adjusted up to 350KHz. The resulting PWM duty ratio ranges from 0% to 100%. The error amplifier features an 11MHz bandwidth and 6V/S slew rate, which enables high converter bandwidth for fast transient response. The AIC1569A provides adjustable over current and short circuit protections. It senses the output current across the on resistance of the upper Nchannel MOSFET without an external low value sense resistor. It also monitors the output voltage with a window comparator and issues a power good signal when the output is within 10% of the rated output voltage. control can provide output regulation within 1% over temperature and line
APPLICATIONS
Power Supply for Pentium(R) II, Power(R) and Alpha(R) Microprocessors. High-Power 5V to 3.xV DC/DC Regulators. Low-Voltage Distributed Power Supplies.
Analog Integrations Corporation DS-1569A-00
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC TEL: 886-3-5772500 FAX: 886-3-5772510
www.analog.com.tw
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AIC1569A
ORDERING INFORMATION
AIC1569A XX PACKAGE TYPE S: SMALL OUTLINE TEMPERATURE RANGE C: 0C~70C
ORDER NUMBER PIN CONFIGURATION
TOP VIEW VSEN 1 OCSET 2 SS 3 VID0 4 VID1 5 VID2 6 VID3 7 VID4 8 COMP 9 FB 10 20 RT 19 OVP 18 VCC 17 LGATE 16 PGND 15 BOOT 14 UGATE 13 PHASE 12 PGOOD 11 GND
AIC1569ACS (PLASTIC SO)
TYPICAL APPLICATION CIRCUIT
C9 1000pF R2 2.2K C2 C8 0.1F VID0 VID1 VID2 VID3 VID4 VSEN OCSET SS VID0 VID1 VID2 VID3 VID4 COMP FB C7 33pF R6 90.9K C6 1000pF R7 1.2M R3 R5 3.01K 47K C5 0.1F RT OVP VCC LGATE PGND BOOT UGATE PHASE
PGOOD
R1 47 C1 1F RFP45N03L + 0.1F 12V L1 1H C3 1000F x 3 5V
M1
L2 3H D1 M2 R4 15K NDP603AL 1N5820 +
VOUT
GND AIC1569A
C4 1000F x 8
DC/DC Converter for Pentium II VCORE
2
AIC1569A
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC ...................................................................................................... 15V Boot Voltage, VBOOT ..................................................................................................... 15V Input, Output, or I/O Voltage ....................................................... GND - 0.3V to VCC+0.3V ESD Classification ................................................................................................... Class 2 Recommended Operating Conditions Supply Voltage, VCC ............................................................................................. 12V10% Ambient Temperature Range ............................................................................ 0C ~ 70C Junction Temperature Range ........................................................................... 0C ~100C Thermal Information Thermal Resistance, JA (Typical, Note 1) SOIC Package......................................................................................... 100C /W SOIC Package (with 3 in2 of Copper) ....................................................... 90C /W Maximum Junction Temperature (Plastic Package) ................................................ 150C Maximum Storage Temperature Range ..................................................... -65C ~150C Maximum Lead Temperature (Soldering 10 sec) ................................................. Note 1: JA 300C is measured with the component mounted on an evaluation PC board in free air.
TEST CIRCUIT
Refer to TYPICAL APPLICATION CIRCUIT.
ELECTRICAL CHARACTERISTICS (VCC= 12V, Ta=25C, unless otherwise specified.)
PARAMETER
VCC Supply Current Nominal Supply Power-On Reset VCC Threshold Rising VOCSET Threshold Oscillator Free Running Frequency Total Variation Ramp Amplitude RT Open 6KTEST CONDITIONS
SYMBOL
MIN.
TYP.
MAX. UNIT
3
AIC1569A
ELECTRICAL CHARACTERISTICS (Continued)
PARAMETER
DAC Output Voltage DAC Output Voltage Accuracy Error Amplifier DC Gain Gain-Bandwidth Product Slew Rate Gate Driver Upper Gate Source Upper Gate Sink Lower Gate Source Lower Gate Sink Protection Over-Voltage Trip (VVSEN/VDAC) OCSET Current Source OVP Sourcing Current SS Current SS Voltage under Current Limit VVSEN=VDAC, VOCSET=5.0V, VPHASE=0V, VFB=VDAC - 50mV VVSEN=0, VOCSET=5.0V, VPHASE=0V, VFB=0V VOCSET=4.5VDC VVSEN=5.5V, VOVP=0V IOCSET IOVP ISS 106 170 30 10 2.0 115 200 125 230 % A mA A V RUGATE RUGATE RLGATE RLGATE 5.8 4.4 4.7 3.0 12 10 12 10 GBW SR 76 11 6 dB MHz V/S VDAC=1.3V~3.5V -1.0 +1.0 %
TEST CONDITIONS
SYMBOL
MIN.
TYP.
MAX. UNIT
SS Voltage under Hard Current Limit Power Good Upper Threshold (VVSEN/VDAC ) Lower Threshold (VVSEN /VDAC ) Hysteresis (VVSEN /VDAC )
0.7
V
VVSEN Rising VVSEN Falling Upper and Lower threshold IPGOOD=5mA VPGOOD
106 84 2 0.5
114 94
% % % V
PGOOD Voltage Low
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AIC1569A
BLOCK DIAGRAM
115% POWER-ON RESET OVP OVP VCC
+ - + -
110%
VSEN 90%
POWER GOOD
PGOOD
+ - + -
50% 10A
+ -
OVER CURRENT IOCS 200A
OCSET
SS
PHASE BOOT 4V UGATE SOFT START REFERENCE VDAC CONTROL LOGIC VCC GND
VID0 VID1 VID2 VID3 VID4 FB COMP
5-BITS DAC
+ -
ERROR AMP
+ -
PWM COMPARATOR
LGATE
PGND
OSCILLATOR
RT
PIN DESCRIPTIONS
PIN 1: VSEN - Converter output voltage sense pin. Connect this pin to the converter output. The PGOOD and OVP comparator circuits use this signal to report output voltage status and perform overvoltage protection function. PIN 2:OCSET - Current limit sense pin. Connect a resistor ROCSET from this pin to the drain of the external MOSFET. ROCSET, an internal 200A current source (IOCS), and the external MOSFET on-resistance (RDS(ON)) jointly set the over current trip point according to the following equation:
IPEAK =
IOCS x ROCSET RDS( ON)
If FB pin voltage is sensed to be below 50% of the internal voltage reference VDAC, the over current comparator cycles the soft-start function. PIN 3:SS - Soft start pin. Connect a capacitor from this pin to ground. An internal 10A current source provides soft start function for the converter.
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AIC1569A
PIN 4: VID0 PIN 5: VID1 PIN 6: VID2 PIN 7: VID3 PIN 8: VID4 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 2.2V 2.1V 2.0V 2.05V 2.00V 1.95V 1.90V 1.85V 1.80V 1.75V 1.70V 1.65V 1.60V 1.55V 1.50V 1.45V 1.40V 1.35V 1.30V
- 5-bit DAC voltage select pin. TTL inputs used to set the internal voltage reference VDAC. When left open, these pins are internally pulled up to 5V and provide logic ones. The level of VDAC sets the converter output voltage as well as the PGOOD and OVP thresholds. Table 1 specifies the VDAC voltage for the 32 combinations of DAC inputs.
PIN 9:COMP
- External compensation pin. This pin is connected to error amplifier output and PWM comparator. An RC network is connected to FB pin to compensate the voltage-control feedback loop of the converter. - The error amplifier inverting input pin. The FB pin and COMP pin are used to compensate the voltage-control feedback loop. - Signal GND. It also serves as the power GND for the upper gate driver.
PIN 10:FB
PIN 13:PHASE - Over current detection pin. Connect the PHASE pin to source of the external MOSFET. This pin detects the voltage drop across the MOSFET RDS(ON) for over-current protection. PIN 14: UGATE- External MOSFET gate drive pin. Connect UGATE to gate of the external MOSFET. PIN 15: BOOT - External MOSFET driver power supply pin. To convert 5V main power to VCORE power by driving N-channel MOSFET, supply voltage of no higher than 12V is recommended since the negative power terminal of the internal driver is internally tied to GND. PIN 16:PGND - Driver power GND pin. PGND should be connected to a low impedance ground plane close to lower NMOSFET source. PIN 17:LGATE - Lower N-MOSFET gate driver pin. PIN 18: VCC - The chip power supply pin. It also serves as power supply for LGATE driver. Recommended supply voltage is 12V. -Over voltage indicator pin. This pin also provides a driver source current to turn on an external SCR in the event of an over voltage condition.
PIN 11:GND
PIN 12:PGOOD- Power good indicator pin. PGOOD is an open drain output. This pin is pulled low when the converter output is 10% out of the VDAC reference voltage.
Table 1. Output Voltage Program VID4 VID3 VID2 VID1 VID0 VDAC 1 0 0 0 0 3.5V 1 0 0 0 1 3.4V 1 0 0 1 0 3.3V 1 0 0 1 1 3.2V 1 0 1 0 0 3.1V 1 0 1 0 1 3.0V 1 0 1 1 0 2.9V 1 0 1 1 1 2.8V 1 1 0 0 0 2.7V 1 1 0 0 1 2.6V 1 1 0 1 0 2.5V 1 1 0 1 1 2.4V 1 1 1 0 0 2.3V
PIN 19:OVP
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AIC1569A
PIN 20: RT - Frequency adjustment pin. Connecting a resistor (RT) from this pin to GND, increase the frequency by the following equation.
FS 200KHz + 5 x 10 5 log RT
PHYSICAL DIMENSIONS
20 LEAD PLASTIC SO (300 mil) (unit: mm)
D
E
H
e
A
B
C
L
SYMBOL A A1 B C D E e H L
MIN 2.35 0.10 0.33 0.23 12.60 7.40 10.00 0.40
MAX 2.65 0.30 0.51 0.32 13.00 7.60
1.27(TYP)
10.65 1.27
A1
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